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List:       flightgear-devel
Subject:    Re: [Flightgear-devel] PDF on pitot-static - comment
From:       Tony Peden <apeden () earthlink ! net>
Date:       2002-09-28 3:11:40
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On Fri, 2002-09-27 at 17:26, Alex Perry wrote:
> Page 46 of the PDF describes the pressure defect, with example values.
> Whether we can adapt this to be a useful lookup table is another matter.
> 
> They also have nice equations, later on, converting test data into a model
> that predicts errors.  However, the conversion implies having raw data.
> Maybe we can try to run the equations in reverse, but that isn't a
> straightforward derivative from the information in the document.

We can calculate freestream total pressure (eq. 2.29), you can then use
that as your raw data.

Note that you can't measure what you get from 2.29 supersonically, as a
shock wave will form in front of the pitot tube.

> 
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-- 
Tony Peden
apeden@earthlink.net
We all know Linux is great ... it does infinite loops in 5 seconds. 
-- attributed to Linus Torvalds


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